Used in the synthesis of purine-based pharmaceuticals, particularly in antiviral and anticancer agents due to its structural similarity to natural purines. Acts as an intermediate in the development of nucleoside analogs that interfere with viral replication or tumor cell proliferation. Also employed in research on thiopurine metabolism, which is relevant to immunosuppressive therapy and treatment of autoimmune diseases. Its thiol and amino groups allow for diverse chemical modifications, making it valuable in medicinal chemistry for designing novel bioactive compounds.